Pyramidelloides (Gastropoda Eulimidae) of the West Indies, with the Description Two New Species

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Pyramidelloides (Gastropoda Eulimidae) of the West Indies, with the Description Two New Species BASTERIA, 54: 105-113, 1990 West Studies on Indian marine molluscs 18. Prosobranchia: in A review of the genus Pyramidelloides (Gastropoda Eulimidae) of the West Indies, with the description two new species M.J. Faber Zoological Museum, University of Amsterdam, P.O. Box 4766, 1009 AT Amsterdam, The Netherlands The in the West is reviewed. Four genusPyramidelloides (5.1.) Indies species are recognized, ofwhich P. and P. multicostatus. A trilirata De two are new to science, glaber syntype of Aclis shell-characters it is clear whether these Folin, 1873, is figured. Regarding only, not very four taxa belong to only one genus, or even to one family. West Indies. Key words: Gastropoda, Prosobranchia, Eulimidae, Pyramidelloides, taxonomy, INTRODUCTION 2 Waren (1984a), in his revision of the Pyramidelloides Nevill, 1885 proved that genus , this taxon (type-species Rissoa miranda A. Adams, 1861, by original designation) belongs to the Eulimidae, and not to the Rissoidae, to which it has often been relegated. He mentioned one species from the West Indies, viz. Aclis trilirata De Folin, 1872. From material in the Zoological Museum in Amsterdam it became clear that at least three other species of Pyramidelloides (5.1.) occur in the Caribbean. One, originally described as Cingulina? carinata Morch, 1876, has never been 3 lost from recorded since. The can be considered but the original description types , the species is recognizable, and not likely to be confused with any other West Indian mollusc taxon. It is figured here for the first time. The other two taxa are described as new. " Usticke (1971: 28) has listed a Pyramidelloides judithae Usticke, 1959". However, in the original description (Usticke, 1959: 86-87), this taxon was described as a member O. is of the genusOdostomia, subgenus Miralda (Pyramidellidae). (M.) judithae a junior of Adams, a true synonym Liamorpha babylonia (C.B. 1845), pyramidellid (Faber, 1988). At first glance it seems unlikely that all four taxa described in this paper belong to all considered members of one genus only. Reasons are given why they are Pyramidelloides. For 17 in ihis scries this issue of Rastcria 2. 1 no. sec p. - In Waren and other 1884 is mentioned. This (1984a), many papers, date is shown on the cover and title However, the dated "The 25th 1885". page. prelate is January ( At least they are not in the Zoological Museum in Copenhagen (Knudscn, in litt.). 106 BASTERIA, Vol. 54, No. 1-3, 1990 ABBREVIATIONS AMNH = American Museum of Natural History, New York City; MCZ = Museum of Comparative Zoology, Cambridge, Mass.; MNHN = Museum National d'Histoire Naturelle, Paris; RMNH = Rijksmuseum van Natuurlijke Historie, Leiden; SMNH = Naturhistoriska Riksmuseet (Swedish Museum of Natural History), Stockholm; ZMA = Zoologisch Museum, Amsterdam; ZMUC = Zoologisk Museum, Copenhagen; o.d. = original designation. SYSTEMATICS Pyramidelloides glaber nov. spec. (figs. 1-3) 0.4 10 Material examined. Holotype (ZMA 389024) length 0.8 mm, width mm; paratypes (ZMA 389025, mostly juvenile and/or broken). Paratypes will be donated to AMNH and SMNH. Type locality. Martinique, Cap Solomon, -25m, leg. Patrick Bou, 1984. Description holotype. Shell small, elongate, with about 1 % nuclear whorls and 3 teleoconch whorls (juvenile). Protoconch with two spiral keels, one on the periphery, both weaker. In between one on top, gradually becoming (on top) are prosocline axial riblets. Teleoconch whorls little for occasional flat-sided, a concave, smooth, except growth scars, and a thin spiral ridge on the periphery, bordering the base, also visible just above the sutures. Base rounded, with a slight depression in the middle. Aperture small, squarish, acute above. Columella straight. No umbilicus. Variability. —Juvenile and subadult specimens have their protoconch still in place. Theirouter lips are thin. The base shows a distinct keel. Adult specimens have a more rounded base, without a distinct keel. The outer lip is thickened and expanded below. The is decollated top always and replaced by a plug. An adult specimen with 5 whorls measured 1.5 x 0.7 mm (top whorls missing). A complete specimen would have about 8 whorls. Distribution. — is known from P.J glaber only the type locality. Remarks. — This can be from the other of the species easily separated species genus by the smooth appearance of the teleoconch shell. It differs from all other smooth Eulimidae in possessing a highly sculptured protoconch (compare the undescribed species of “Eulima” (?Hebeulima) from Curacao in fig. 4), which is lost and replaced by a plug in adult shells. As I consider the features distinctive in this I have protoconch most new taxon, selected an immature specimen as holotype. 1-7. Various two new of Figs. Eulimidae, including species Pyramidelloides. 1-3, Pyramidelloides glaber n. sp., -25 P. 68. Martinique, Cap Solomon, m (leg. Bou). 1, holotype, x 2, juvenileparatype showing protoconch, ” x 135. 3, adult x 43. 4, “Eulima” n. Curaçao paratype, (?Hebeulima) sp., (leg. R.G. Moolenbeek), x 50. 5-6, Pyramidelloides multicostatus n. sp., Little Cayman, Owen Island, beach (leg. Dr. P. Wagenaar Hum- x 47. 6, 6a, ventral do. melinck). 5, paratype, holotype; side, x 47; 6b, do., sculpture detail, x 400; 6c, pro- toconch, x 140. P. miranda Arabian Messilah R. 7, (A. Adams). Gulf, Kuwait, beach (leg. & J. Nolen), x 37. Faber: Studies on West Indian molluscs IS 107 108 BASTERIA, Vol. 54, No. 1-3, 1990 Pyramidelloides multicostatus nov. spec. (figs. 5-6) Material examined. Holotype, length 1.5 mm, width 0.6 mm (ZMA 389026); 14 paratypes (ZMA 389027). Paratypes will be donated to AMNH, MCZ, MNHN, RMNH, SMNH and ZMUC. Type locality. Little Cayman, Owen Island, beach, leg. Dr. P. Wagenaar Hum- melinck, 7:V1.1973. Description holotype. Shell small, elongate, with about IIA nuclear whorls, the half smooth for lines; the half with curved lower convex, except growth upper concave, axial grooves, ending in a sharp keel on top, flattened above, with curved growth lines, the keel. Postnuclear whorls becoming more prominent towards spiral (teleoconch) 5, with the whorls shouldered A second a strong spiral cord, giving a appearance. spiral cord, just below the suture becomes visible on the last whorl above the base. Near the these cords deviate bit from each other. All whorls aperture two a postnuclear are covered by sharp, pronounced axial riblets, about 35 on the last whorl. These riblets are knobby where they cross the spiral cord(s). The microsculpture consists of frilled that do the axial riblets. exceedingly fine, spiral striae, not cross Aperture ovate, a little acute above. Peristome complete; formed by the ultimate axial riblet. Outer lip thick, broadened and expanded below, near the spire. Umbilicus closed. Variability. All paratypes are very similar to the holotype in outline and sculpture, and are only slightly variable in size and slenderness. Distribution. — .P. multicostatus is only known from the type-locality. Remarks. This species is the only West Indian member of the genus with this, A" elaborate axial sculpture. In it resembles "P. spec. in Waren (1984a: fig. 90). But in the latter, from the Arafura Sea, the axial ribs are much broader, less in resembles Coenaculum number, and undulating. It also minutulum (Tate & May, 1900) and Awanuia dilatata Powell, 1927, from New South Wales and New Zealand respect- ively. Both have, among other differences, also fewer axial ribs. See also sub Discussion. Pyramidelloides carinatus (Mörch, 1876) (figs. 8-9) Original description. "T. minuta, candidissima, subulato-cylindrica; anfr. 8-9 carinis duabus validis angustis planis, spiralibus acutis, posteriore validissima; apex decollatus; apertura parva irregulariter pentagona, extus obsolete marginata. Long. 4 1%, lat. Vi mm. Hab. St. Thomas (Riise). Rissoina insolita Desh . Moll. Reunion pi. 40. f. 15-17 affinis sed different anfr. ult. quadricarinato." 4 Footnote by M.J.F. According to Warcn (1984a: 289) Rissoina insolita Dcshaycs, 1863, is a junior of miranda synonym Pyramidelloides (A. Adams, 1861). Figs. 8-12. Species ofPyramidelloides. 8-9, P. carinatus (Mörch), Puerto Rico, La Parguera, Reef Media Luna R.G. x (leg. Moolenbeek & W. v.d. Hijden). 8, adult; 8a, ventral side, 37; 8b, do., showing decollated top with plug, x 110. 9, subadult; 9a, ventral side, x 37; 9b, do. protoconch, x 120; 9c, do., sculpture details, 185. P. triliratus Marie-Galante Dr. P. WH x 10-12, (De Folin). 10, (leg. Wagenaar Hummelinck, sta. 744); 10a, adult, x 24, 10b, detail of sculpture of do., x 185. 11-12, Guadeloupe, Pointe à Pitre (MNHN). 11, paralectotype, protoconch, x 120. 12, lectotype, ventral side, x 21. Faber: Studies on West Indian molluscs 18 109 110 BASTERIA, Vol. 54, No. 1-3, 1990 4 Material examined. Puerto Rico, km off Punta Cadena near Mayaguez, -90 m, 1 specimen (ZMA, leg. Dr. P. Wagenaar Hummelinck, 14.1X. 1963, Wagenaar Hummelinck, 1977: sta. 1415); Puerto Rico, off La Parguera, reef Media Luna, -14 118 -12 120 Puerto off La m, specimens; same locality, m, specimens; Rico, Parguera, reef Enrique, -15 m, 34 specimens; same locality, -2 m, 32 specimens (ZMA, all specimens collected by R.G. Moolenbeek & W. van der Hijden, VI. 1982). St. Maarten, Great Bay, beach, 1 specimen (worn) (ZMA, leg. R.G. Moolenbeek& W. St. G.W. Nowell van der Hijden, VIII. 1982); Thomas, 1 specimen (AMNH, leg. Usticke). Description. Shell small, slender, translucent white, with about IVi nuclear whorls and about 5 postnuclear whorls. Transition indefinite. Nuclear whorls nearly straight-sided, with a prominent spiral keel and flattened above. Subsequent whorls with two spiral cords; the strongest about halfway each whorl, the other a little above the which is indistinct. Between these cords the whorls look somewhat suture, concave. Microsculpture consists of exceedingly fine spiral grooves, about 10 |xm apart, which the cords. Base with in the middle. also overrun spiral convex, a slight depression Aperture simple, ovate, a little pointed above.
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